Description: lib/timerqueue: Rely on rbtree semantics for next timer
References:
 https://bugzilla.redhat.com/show_bug.cgi?id=2005258
Notes:
 bwh> It's not totally clear what the bug is, but the code in 4.9 is
 bwh> similar enough to 4.19 that I think it must also be affected.
 bwh> For 4.9, commit cd9e61ed1eeb "rbtree: cache leftmost node internally"
 bwh> needs to be applied first.
Bugs:
upstream: released (5.4-rc1) [511885d7061eda3eb1faf3f57dcc936ff75863f1]
5.10-upstream-stable: N/A "Fixed before branching point"
4.19-upstream-stable: released (4.19.210) [b9a1ac8e7c03fd09992352c7fb1a61cbbb9ad52b]
4.9-upstream-stable: released (4.9.298) [ef2e64035f074bfeef14c28347aaec0b486a9e9f]
sid: released (5.4.6-1)
5.10-bullseye-security: N/A "Fixed before branching point"
4.19-buster-security: released (4.19.232-1)
4.9-stretch-security: released (4.9.290-1) [bugfix/all/lib-timerqueue-rely-on-rbtree-semantics-for-next-tim.patch]